An Eco-friendly Leucas Aspera Leaves Extract Inhibitor for Copper Corrosion in Hydrochloric Acid Medium
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An Eco‑friendly Leucas Aspera Leaves Extract Inhibitor for Copper Corrosion in Hydrochloric Acid Medium N. Kavitha1 · J. Ravichandran1 · A. Murugesh1 Received: 3 April 2020 / Revised: 4 July 2020 / Accepted: 22 July 2020 © Springer Nature Switzerland AG 2020
Abstract The adsorption and inhibition effects of methanol leaf extract of Leucas Aspera (MLA) on the corrosion of copper in HCl medium were studied by weight loss measurements, potentiodynamic polarization, and electrochemical impedance spectroscopy and surface analysis to evaluate the inhibition efficiency. The adsorption behavior of the extract on the Cu surface was found to obey Freundlich isotherm. Electrochemical analysis indicated that the inhibition is through charge transfer reaction and the extract acted as a cathodic mixed-type inhibitor. Field emission scanning electron microscopy and energydispersive X-ray spectrometry confirmed that the extract is adsorbed on to the metal surface, which protects copper against further corrosion. Keywords Copper · Weight loss · SEM-EDXS · Potentiodynamic polarization · Leucas aspera
1 Introduction Copper is a metal that has a wide range of applications owing to its versatile properties. It finds applications in electronics for the production of wires, sheets, and tubes besides in the formation of alloys. Copper and its alloys are highly regarded because of their application in marine industries, power stations, and heat exchangers [1]. It is also used as a material for piping in the household water system [2] and is widely used in heating and cooling devices. Such devices are cleaned by acid pickling process using a hydrochloric acid solution. It is important to reduce the destructive effect of hydrochloric acid on the devices during the cleaning process. In the nuclear industry, copper alloys are used in condensers where the steam after turning the turbine is required to be cooled [3]. Copper has been widely used as a material in pipelines for domestic and industrial water utilities, heat conductors, heat exchangers, in electronic industries, and communications as a conductor in electrical power lines. Corrosion products and deposited scales hurt heat transfer. This effect decreases the heating efficiency of the equipment * A. Murugesh [email protected] 1
Department of Chemistry, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Tamil Nadu, Coimbatore 641020, India
and a periodic de-scaling and cleaning in hydrochloric acid pickling solutions are necessary. Thus, the corrosion of copper and its inhibition in hydrochloric acid solutions have been extensively studied by several researchers [4–7]. Copper is also exclusively used for piping and delivery of water for the marine industry. These pipes are frequently employed in a medium where Cl− ions are present [8]. In some particular environmental conditions, attack by pitting sometimes occurs. The corrosion of copper and the formation of corrosion products on its surface harm the performance of a system constructed from copper and may reduc
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